<template>
  <div id="root">
  <div class="todo-container">
    <div class="todo-wrap">
        <HeaderTop @addTodo="addTodo"/>
        <List :todos="todos"/>
        <FooterDown :todos="todos" @checkAllTodo="checkAllTodo" @clearAllTodo="clearAllTodo"/>
    </div>
  </div>
</div>
</template>

<script>
    import HeaderTop from './components/HeaderTop'
    import List from './components/List'
    import FooterDown from './components/FooterDown'

    export default {
        name:'App',
        components:{HeaderTop,List,FooterDown},
        data() {
        return {
            todos:JSON.parse(localStorage.getItem('todos')) || []
            }
        }, 
        methods: {
            addTodo(todoObj){
                this.todos.unshift(todoObj)
            },
            checkTodo(id){
                this.todos.forEach((todo)=>{
                    if(todo.id===id) todo.done=!todo.done
                })
            },
            delTodo(id){
                console.log(id)
                this.todos = this.todos.filter(todo=> todo.id !==id)
                
            },
            //全选或取消全选
            checkAllTodo(done){
                this.todos.forEach((todo)=>{
                    todo.done = done
                })
            },
            //删除全部已完成事件
            clearAllTodo(){
                this.todos =this.todos.filter(todo=>!todo.done)
            }
        },
        watch:{
            todos:{
                deep:true,
                handler(value){
                    
                    localStorage.setItem('todos',JSON.stringify(value))
                }
                
            }
        },
        mounted() {
          this.$bus.$on('checkTodo',this.checkTodo);
          this.$bus.$on('delTodo',this.delTodo)

        },
        beforeDestroy() {
          this.$bus.$off('checkTodo')
          this.$bus.$off('delTodo')
        },
    }

</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}



</style>
